a(n) = A087745(n+1).

Terms

a(0) =1a(1) =3a(2) =3a(3) =5a(4) =5a(5) =15a(6) =15a(7) =17a(8) =17a(9) =51a(10) =51a(11) =85a(12) =85a(13) =255a(14) =255a(15) =257a(16) =257a(17) =771a(18) =771a(19) =1285a(20) =1285a(21) =3855a(22) =3855a(23) =4369a(24) =4369a(25) =13107a(26) =13107a(27) =21845a(28) =21845a(29) =65535